Dyeing.



t e wa Wm ARTHUR SGHLEGEL, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, ASSIGNOR TO BADISOHE ANILIN & SODA FABRIK, OF LUDWIGSHEEN-ON-THE-RHINE, GERMANY, A CORPORA- TION.

DYEING.

Specification of Letters Patent.

Patented July 14, 1908.

Application filed April 17, 1906. Serial No. 312,211.

To all whom it may concern:

Be it known that I, ARTHUR SonLEeEL, chemist, subject of the German Emperor, residing at Ludwigshafen-on-the-Rhine, in

the Kingdom of Bavaria, German Empire, have invented new and useful Improvements in Dyeing, of which the following is a specification. v

I have discovered that stable dyeings of an even character can be produced by means of the coloring matters of the indanthrene series and other vat coloring matters of the anthracene series,,without it being necessary to make use of special apparatus. For this purpose the textile material, or fiber, (which I will refer to as cotton), which has previously been bleached, or extracted, with boiling water, is treated with a paste of coloring matter, which may be done either by printing or padding, and the cotton is then either dried, or is rolled up without having been dried. The cotton so prepared is then treated with a solution, or sus ension, of an alkaline reducing agent, such or instance as hydro-sulfite, tin hydrate, or ferrous hydrate, and is afterwards washed, acidified and finished. In the alkaline reducing solution, the coloring matter, which has been applied in an even manner and up to that t1me has been only mechanically fastened to the cotton, is ap arently reduced to thehydro compound an in this state is at once fixed to the cotton and the developing bath removes practically no coloring matter. All coloring matters of the indanthrene series and the other vat-coloring matters ofthe anthracene series can be used in carrying out my invention. I mention for instance. lndanthrene S, indanthrene C, flavanthrene,

melanthrene, fuscanthrene, cyananthrene, and violanthrene, either used alone, or as mixtures of two, or more, of them. Indigo can not be applied in this way. 4

The following example'will serve to further illustrate the nature of my invention and the method of carrying it into practical efiect, but my invention is not confined to this example.

Mix together slowly and thoroughlyto a very the paste from ten (10) to two hundred (200), grams'of one of the above mentioned coloring matters and about one hundred and twenty-five (125) grams of gum or starch thickening, dilute 'With"water 'to one (1) 5.5 liter and pass the paste through a-finemeshed cloth. Apply this paste to the cotton goods either in the printing machine, or in the padding machine, and then either dry the cotton, or roll it up without drying. Treat the cotton so prepared on the jigger for about half an hour (30 minutes), at a temperature of from sixty to sixtyfive degrees centigrade, in a developing bath containing about three hundred (300) liters of water, seven and a half (7.5) liters of twentyfour (24) per cent. caustic soda solution and three (3) liters of a hydrosulfite solution which has been made up from three and three-tenths (313) kilograms of hydrosulfite concentrated in powder B. A. S. F., one and three quarter (1.75) liters of twenty-four (24) per cent. caustic soda solution and twenty-five (25) liters of water. Wash well, acidify for a short time in a 'bath containing two (2) cubic centi meters of ninet -seven (97) per cent. sulfuric acid per iter, wash and soap while boiling.

In order to produce light shades, the prepared material can be developed bybeing passed once through the hydrosulfite-caus tic-soda-bath on a continuous broad Washing machine.

Now what I claim is:

1. The process for the production of stable dyeings by applying to the material a paste of a hereinbefore defined anthracene coloring matter and then treating the material with an alkaline reducing agent in the presence of water and alkali.

2. The process for the production of stable dyeings by applying to the material a paste of a hereinbefore defined anthracene coloring matter, then drying the material 

